USB-to-UART-with-CH340K

ampnics·USB-to-UART-with-CH340K·DanyFlash/Flash Bridge.kicad_sch

USB-to-UART-with-CH340K

About the USB-to-UART-with-CH340K PCB

USB-to-UART-with-CH340K is an open source PCB design by ampnics, published on GitHub. It is a board, with 29 components from 19 distinct parts.

Other key parts include the CH340K and AP2112K-3.3. By type, the board carries 9 resistors, 7 diodes, 6 capacitors, 3 connectors, 2 ICs and 2 transistors.

It belongs with the usb & debug tools designs in this gallery.

From the project

A compact and reliable USB to UART bridge perfect for programming and debugging microcontrollers.

A compact and cost-effective USB to UART converter board based on the CH340K IC, designed for programming and debugging microcontrollers such as ESP32, STM32, and Arduino.

🔧 Features - CH340K USB to Serial IC - 3.3V and 5V output options (selectable via jumper) - TX/RX status LEDs - Onboard USB-C connector for modern devices - Compact form factor for breadboard compatibility - ESD protection and filtering capacitors

Main components on the USB-to-UART-with-CH340K

CH340K AP2112K-3.3

USB-to-UART-with-CH340K bill of materials (BOM)

29 components, 19 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	CH340K	SSOP-10-1EP_3.9x4.9mm_P1mm_EP2.1x3.3mm	U1
1	AP2112K-3.3	SOT-23-5	U2
2	SS8050	SOT-23	Q1, Q2
1	USB_C_RECEPTACLE_USB2.0_16P USB_C_Receptacle_USB2.0_16P	USB_C_Receptacle_HCTL_HC-TYPE-C-16P-01A	J1
1	CONN_02X04_TOP_BOTTOM Conn_02x04_Top_Bottom	PinHeader_2x04_P2.54mm_Horizontal	J2
1	1054440001	MOLEX_1054440001	J3
3	LESD5D5.0CT1G	TVS_LESD5D5.0CT1G	D1, D2, D4
1	D_Schottky	D_SOD-523	D3
3	LED	LED_0603_1608Metric	D5, D6, D7
2	100NF 100nf	C_0805_2012Metric	C1, C2
1	10UF/25V 10uF/25V	C_0603_1608Metric	C3
1	10UF 10uF	C_0805_2012Metric	C4
1	10UF 10uF	C_0603_1608Metric	C5
1	0.1UF 0.1uF	C_0603_1608Metric	C6
2	5.1K	R_0603_1608Metric	R1, R2
3	220R	R_0603_1608Metric	R3, R4, R5
2	10K 10k	R_0603_1608Metric	R6, R7
1	100K 100k	R_0603_1608Metric	R8
1	5.1K	R_0603_1608Metric	R9

USB-to-UART-with-CH340K design files

The KiCad project lives in the ampnics/USB-to-UART-with-CH340K repository on GitHub; these links point at the commit this page was built from.

USB-to-UART-with-CH340K: common questions

How many components are on the USB-to-UART-with-CH340K?

29 components, from 19 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the USB-to-UART-with-CH340K design files?

From the ampnics/USB-to-UART-with-CH340K repository on GitHub, which has the schematic and the BOM; the links under Design files point to each one.

Can I use the USB-to-UART-with-CH340K design in my own project?

The repository has no license, so all rights stay with ampnics. Use it as a reference, and ask the author before reusing the design.

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